F n o r m a lv ill i n



A. L. OTIS.

Hot Air Furnace;

Patented Sept; 28, 1869.

Al. Otis.

N-PETERS, PHOYO-LITHUGRAPHER. WASHINGTO4. I c

u u y u oh futmi, the o nty f fMfiLeam an I tatenfIllinois, haveinvented anew and -usefiilfllmprove meut in Heating-Furnaces Lldoherebyaidecla that the following is afull,

heating- The invent o consistshin ertairi improved arrangementsfof thecjevers ot izbntal furnaces,;calculated curethe ,heatigjg 1o the airj'as n iuohi'as possible lf'through'theconducting pipes;

Also,lcertaii unproyementsm? the constguction of heatbyj radiatioulandby jconttection; i a u i in the arrangement of Also,"certaiu irnpryeni a the grate feud Alsqfcertaim the air provements in means (for lieatiug.

ter, more fullyfj specified Figure represen a furnace, constr teansrrjerse sectional elevation ccording to my improvea a a a s P, ahereby esca ing jap'art I propose to make the escapepassage 1) for theheated eugth f the valtop O, and to provide age ,va E, so asto open orclose tlx'roii hout the whole length, wherelear, and exact, descript onthereof, which will enable ;others skillediiuthe:art 0" make anduse thesame,v the, accompanying drawings, 1

t l'chfisfto proyide a more deyeloping heat for 11 ,1341

he waswere,remade;ea qu tea to give out more" pret'iou .ftoshpplyingthefirefall ashereinaf- V ougitudinal sectionaleleyar s ed togpass,evenlyfover the i he heaterfthereby taking i'carejcorrugated,lproyidewith b y radiation and .by convecu M 'AL; L L 1 No 1 s.

' i i In order tofacilitate the combustion of the fnel iu I the furnace,as well as the radiation of heat therefrom,

I provide at the back end of the furnace a V-shaped flue, H, throughwhich the product of combustion passes in a prolonged course, calculatedto increase the radiating-surface; and through this flue I pass anairy-supplying perforatedtube, K, leading from the backfo f the furnaceinto the interior space, terminating, preferably, near the front of thefire-chamber, at

about the point a, where the air is discharged in a distributed way tothe -fire.

The passingof this tube through the said flue H, where it encounters theheated product of combustion, causes the air thus passing through it tobe considerablyheated, thereby greatly facilitating combustion.

Birepresents an opening formed in the rear wall of the fire-chambeiytoadmit the product'sof combustion to the flue H, in which the same firstdescend, then ascend to be discharged through the exit-flue N.

u I is an opening made at the bottom of flue H, to permit the readyremoval of the coarse products of combustion which may be deposited, orin any manner accumulateiu the flue.

' It will, of course, be understood that the three openings, P, L, andM, above alluded to, are designed to jbe-provided with suitable hingedorother doors.

My improvement in the arrangement of the grate consists in placing thebars in a circular line, lowest at W the centre, clearly shown at I,fig. 1, which not only increases the fire-surface, but so *shapes thefire that the air passing into it frombelow is admitted, measurably, atthe sides, as well as at the bottom,

Having thus described my invention,- i d I claim as new, and desire tosecure by Letters The arrangement of the hot-air passage D,substantially as specified. r i "2, The arrangement, with the sidewalls, of the plates F, substantialiy asspecified. p

3. The arrangement of the V-shaped flue and air supplying pipeK,substantially as specified.

4. The arrangement of the grate I, as specified;

Theabove specification of my invention signedl by me,this 13th day ofMay, 1869. l

. i A. L. OTIS,

Witnesses: 1

.' WM. H. BRADLEY,

- S. W. Sonmnsh

